Howard: Sheldon, don't take this the wrong way, but, you're insane.
Leonard: That may well be, but the fact is it wouldn't kill us to meet some new people.
Sheldon: For the record, it could kill us to meet new people. They could be murderers or the carriers of unusual pathogens. And I'm not insane, my mother had me tested.

Stuart: Oh, Sheldon, I'm afraid you couldn't be more wrong.Sheldon: More wrong? Wrong is an absolute state and not subject to gradation.Stuart: Of course it is. It's a little wrong to say a tomato is a vegetable, it's very wrong to say it's a suspension bridge.

Raj: Well, I'm a Hindu. My religion teaches that if we suffer in this life we are rewarded in the next. Three months at the North Pole with Sheldon and I'm reborn as a well-hung billionaire with wings.

Leonard: Howard, this is big science. You could be the engineer who builds the equipment that puts us on the cover of magazines.Howard: I could also be the engineer who builds the crossbow that kills Sheldon.